The brushless motor is composed of a motor body and a driver and is a typical electromechanical integration product. Since the brushless DC motor operates in a self-controlled manner, it does not have an additional starting winding on the rotor like a synchronous motor that starts under heavy load under variable frequency speed regulation, and it will not produce oscillation and loss of synchronization when the load changes suddenly. The permanent magnets of small and medium-capacity brushless DC motors now mostly use rare earth neodymium iron boron (Nd-Fe-B) materials with high magnetic energy product.
Brushless DC motors use semiconductor switching devices to achieve electronic commutation, that is, electronic switching devices are used to replace traditional contact commutators and brushes. It has the advantages of high reliability, no commutation sparks, and low mechanical noise. It is widely used in high-end recording sockets, video recorders, electronic instruments and automated office equipment.